/Engine/Plugins/Experimental/LandscapePatch/Source/LandscapePatch/Public/LandscapeTexturePatch.h
Set how zero height is interpreted, see comments in ELandscapeTextureHeightPatchZeroHeightMeaning.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="LandscapePatch") void SetZeroHeightMeaning ( [ELandscapeTextureHeightPatchZeroHeightMeaning](API\Plugins\LandscapePatch\ELandscapeTextureHeightPatchZero-) ZeroHeightMeaningIn )